Earlier this week, Sanders secured five seats on the party's platform committee, with one immediately going to James Zogby, a staunch Palestinian advocate and critic of Israel.

Last month, we focused on Sanders' reliance on Linda Sarsour as a campaign surrogate. Sarsour also is a Palestinian activist with a history of vitriolic anti-Israel statements. "Nothing is creepier than Zionism," she wrote on Twitter about the idea that Jews can return to their ancestral homeland as a refuge from global anti-Semitism. To Sarsour, that ideal is racist.

Memorial Day weekend's approach brings to mind another prominent Sanders supporter, Zahra Billoo, who has repeatedly expressed discomfort with the holiday. "Many of our troops are engaged in terrorism," she wrote in June 2012.

Billoo heads the Council on American-Islamic Relations' (CAIR) San Francisco office. CAIR has roots in a Hamas-support network created by the Muslim Brotherhood in American,internal documents and eyewitness accounts show.